Aptitude - Time and Distance - Discussion
Discussion Forum : Time and Distance - General Questions (Q.No. 5)
5.
Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?
Answer: Option
Explanation:
Due to stoppages, it covers 9 km less.
| Time taken to cover 9 km = |  |
9 | x 60 |  min |
= 10 min. |
| 54 |
Discussion:
210 comments Page 8 of 21.
Swetha said:
2 decades ago
I have the same doubt that what rahul having..if we subtracting two speeds ,then we will get difference in speed na? how we got the distance 9 km?
Supreeth said:
1 decade ago
Can't we solve this question like this? if no why?
We now that, Displacement(S) = Velocity(V) * Time taken(t).
ie,s=vt.
consider 1st condition..
Let the distance travelled by bus be 'x'm.
therefore,x=54t.(without stoppage).......(1)
From 2nd condition..
x=45(t+y)........(2)
(y=total stoppage time)
Dividing 1 & 2 n solving we get bus stops for 12 mins in 1 hour.
We now that, Displacement(S) = Velocity(V) * Time taken(t).
ie,s=vt.
consider 1st condition..
Let the distance travelled by bus be 'x'm.
therefore,x=54t.(without stoppage).......(1)
From 2nd condition..
x=45(t+y)........(2)
(y=total stoppage time)
Dividing 1 & 2 n solving we get bus stops for 12 mins in 1 hour.
Piyus said:
1 decade ago
Why it will be 10 minutes instead of 12 minutes ?
Sumit said:
1 decade ago
The time taken by the bus for i k.m is 60/54=1.11 min
so if the bus travels 9 k.m less due to stoppage
then the ans will be =1.11*9=10 min.
so if the bus travels 9 k.m less due to stoppage
then the ans will be =1.11*9=10 min.
Chetna said:
1 decade ago
Why we consider only 54 but not 45?
Dhruv said:
1 decade ago
Good explanation jaya.
Ajit said:
1 decade ago
Simple is that you hav to calculate the wasted time=time taken by bus to cover 9kms).
In one min it covers 0.9 kms.
For 9kms-?min.
You get 10min.
In one min it covers 0.9 kms.
For 9kms-?min.
You get 10min.
Kasi said:
1 decade ago
Good explanation kushal :)
Krishn said:
1 decade ago
I still didn't understand.
If 54km - 45 km = 9 km. That is speed reduces by 9 km/hr.
So 60/9 = 20/3 per min...now how do i proceed next?
If 54km - 45 km = 9 km. That is speed reduces by 9 km/hr.
So 60/9 = 20/3 per min...now how do i proceed next?
Shro said:
1 decade ago
Hey somebody explain it clearly 54km/hr-45km/hr=9km/hr
Why to consider only 9km?
why not 9km/hr?
The answer is clearly 9km /hr.
Then why to convert it into minutes?
it should be only 9/54= 1/6 or say 0.16
Why to consider only 9km?
why not 9km/hr?
The answer is clearly 9km /hr.
Then why to convert it into minutes?
it should be only 9/54= 1/6 or say 0.16
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